Hello, all- just wanted to relay this. I finally got around to rear-wall
diffusion in my room, and just decided for now to use a 7' wide, 3' high poly
(depth is around 11", made with 1/8" ply). The rear of my control room has been
kind of boomy, and I figured it'd help out some as well as provide the
diffusion.

Wow- big difference- the low end is much, much closer to even front to back
(even
though there are some other spots I need to flatten out). Very easy, big gain.
I
like that.